[Limdep Nlogit List] Nlogit ;pds

Mahsa Taslimi mahsataslimi at gmail.com
Tue Dec 24 12:42:20 AEDT 2019


Hi again,
I got a problem with Estimating WTP in LCRPL model. it is overestimated. I
have 3 levels for the price: 400 (status quo), 1000 and 2000. The MWTP is
above 2000. I don't know what to do, Thanks

On Thu, Dec 19, 2019 at 10:40 PM Mahsa Taslimi <mahsataslimi at gmail.com>
wrote:

> Thank you. it is very helpful.
>
> Best regards
> Mahsa
>
> On Thu, Dec 19, 2019 at 10:33 PM William Greene via Limdep <
> limdep at mailman.sydney.edu.au> wrote:
>
>> Mahsa.  You can ignore the 392 (= 784/2)  You should be using PDS=8
>> in all cases.  The problem is that the program is reconciling the general
>> use of PDS for by LIMDEP with the special counting rule for the NLOGIT
>> multinomial choice commands.  I'm assuming that you really do have 3
>> alternatives every time and that the choice set is correctly set for all
>> the
>> choice models.
>> ./B. Greene
>>
>> On Thu, Dec 19, 2019 at 1:53 PM Mahsa Taslimi via Limdep <
>> limdep at mailman.sydney.edu.au> wrote:
>>
>> > Thanks, Dr. Greene for replaying.
>> > I have two more questions left, I have 98 individuals and 8 choice cards
>> > and 3 alternatives in each choice cards and 2352 rows. all Data are the
>> > panel.
>> >
>> > I am using RPLOGIT, LCLOGIT, and LCRPLOGIT commands in the NLOGIT.
>> based on
>> > your comment, I should use;pds=8. is it right?
>> > But in LCRPLOGIT the results of estimation says that the N=784, fixed
>> > number of observations is 2, the lcm model with panel 392  groups and
>> the
>> > WTP are for 392 groups. how should I interpret 392? I don't know what is
>> > it?
>> >
>> > Thanks again
>> > Mahsa
>> >
>> >
>> >
>> > On Thu, Dec 19, 2019 at 9:28 PM William Greene via Limdep <
>> > limdep at mailman.sydney.edu.au> wrote:
>> >
>> > > Mahsa.  For commands that have verb NLOGIT, the ;PDS is the number of
>> > > choice
>> > > tasks.  One of my data sets has 12,800 rows of data.  There are 400
>> > > individuals in
>> > > the sample.  Each individual faces 8 choice tasks.  Each choice task
>> > > involves 4
>> > > alternatives.  So, the number of choice tasks in the data set is
>> > 12,800/4 =
>> > > 3,200.
>> > > For purposes of "panel data," the PDS for NLOGIT commands would be
>> > ;Pds=8.
>> > > Note that ;PDS for other commands such as PROBIT would be Pds=32, but
>> of
>> > > course,
>> > > this is wrong for multinomial choice data.
>> > > /B. Greene
>> > >
>> > > On Thu, Dec 19, 2019 at 11:50 AM Mahsa Taslimi via Limdep <
>> > > limdep at mailman.sydney.edu.au> wrote:
>> > >
>> > > > Hi
>> > > >
>> > > > I am estimating RPL, LC, and LC-RPL models. I have a question about
>> the
>> > > > observation and sample size.
>> > > > h have 2352 observations which are 784 in Nlogit. and the RpL got ;
>> PDS
>> > > for
>> > > > the fixed variable or the grouping.
>> > > > the estimation says I have 784 observations and the RPL or LC models
>> > got
>> > > 98
>> > > > groups and 2= pds. actually the WTP wil be 392 rows. what is this
>> 392?
>> > is
>> > > > it the observations? or what?
>> > > >
>> > > > How does it work? i am learning it by myself. can anyone help me
>> with
>> > > this?
>> > > >
>> > > > Thanks
>> > > > Mahsa
>> > > > _______________________________________________
>> > > > Limdep site list
>> > > > Limdep at mailman.sydney.edu.au
>> > > > http://limdep.itls.usyd.edu.au
>> > > >
>> > > >
>> > >
>> > > --
>> > > William Greene
>> > > Department of Economics, emeritus
>> > > Stern School of Business, New York University
>> > > 44 West 4 St.
>> > > New York, NY, 10012
>> > > URL: https://protect-au.mimecast.com/s/QYeICgZowLHorAK5sN339Q?domain=people.stern.nyu.edu
>> > > Email: wgreene at stern.nyu.edu
>> > > Ph. +1.646.596.3296
>> > > Editor in Chief: Journal of Productivity Analysis
>> > > Editor in Chief: Foundations and Trends in Econometrics
>> > > Associate Editor: Economics Letters
>> > > Associate Editor: Journal of Business and Economic Statistics
>> > > _______________________________________________
>> > > Limdep site list
>> > > Limdep at mailman.sydney.edu.au
>> > > http://limdep.itls.usyd.edu.au
>> > >
>> > >
>> > _______________________________________________
>> > Limdep site list
>> > Limdep at mailman.sydney.edu.au
>> > http://limdep.itls.usyd.edu.au
>> >
>> >
>>
>> --
>> William Greene
>> Department of Economics, emeritus
>> Stern School of Business, New York University
>> 44 West 4 St.
>> New York, NY, 10012
>> URL: https://protect-au.mimecast.com/s/QYeICgZowLHorAK5sN339Q?domain=people.stern.nyu.edu
>> Email: wgreene at stern.nyu.edu
>> Ph. +1.646.596.3296
>> Editor in Chief: Journal of Productivity Analysis
>> Editor in Chief: Foundations and Trends in Econometrics
>> Associate Editor: Economics Letters
>> Associate Editor: Journal of Business and Economic Statistics
>> _______________________________________________
>> Limdep site list
>> Limdep at mailman.sydney.edu.au
>> http://limdep.itls.usyd.edu.au
>>
>>


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